Width is measured across the chest below the sleeves from seam to seam. Height is measured from the bottom of the shirt to the highest point on the shoulder (where the seam meets the neck).

Please note that each product has its own specific sizing chart.
SizeWidth (inches)Height (inches)
Junior Small - Light Blue14.524
Junior Medium - Light Blue15.525
Junior Large - Light Blue16.526.5
Junior XL - Light Blue1727